How To Connect PC Audio To A/R Reciever

Hi everyone, just want to say thanks for everyone who helps millions of viewers with thier problems.


------Question------

I have a SB Audigy 2 Sound card ( Here is how it looks)
http://kiskerarak.hu/img/goodies/g12274....

and a Onkyo Ht-R550 Reciever

(Specifications) http://www.onkyousa.com/model.cfm?m=ht-s...

(Image of ports behind reciever)
http://www.onkyousa.com/zoom.cfm?class=s...

I was wondering what is the best possible connection i can make to connect the computers audio to my onkyo reciever.

I have a 7.1 setup home theater setup in this room, and i was wondering what cables/ jacks i should use i oreder to get the maximum quality between the two.

Once again, thanks for your help and support. It is much appreciated.